Carbon Rear Diffuser - Porsche 981 Cayman

2,194.50 1,995.00 1995.0 USD


Add to Cart


Rear diffusers are extremely efficient downforce producing devices when designed properly. We set out to produce a functional rear diffuser for the Porsche 981 GT4 using state of the art R&D processes. The assembly blends function and form utilizing carbon fiber, sheet metal, and hard rubber.

Utilizing scan data, CAD, and ANSYS Fluent analysis software; we were able to design and produce a functional and aesthetically pleasing rear diffuser for this Porsche chassis.

The three main diffuser planes are produced from 2x2 twill, autoclave cured, carbon fiber; while the strakes are manufactured from durable polyurethane for longevity.  

The entire unit bolts to chassis locations through multiple sheet metal brackets.  There is absolutely no drilling or fabrication required for installing this rear diffuser.


  • Diffuser Main Plane, Left-Hand

  • Diffuser Main Plane, Center

  • Diffuser Main Plane, Right-Hand

  • Bracket (4)

  • Strake, Hard Rubber (4)

  • Hardware Kit, Includes All Hardware Necessary for Install




Improved Vehicle Performance, Both with Increase in Downforce and Reduction In Drag

Analyzed with ANSYS Fluent to Improve Performance Given Build Volume

Flows with the Factory Bumper Lines

Durable and Replaceable Strake Design for Improved Longevity

Modular Design - Able to add on Flat Underbody Cover for Improved Performance




2x2 Twill, Autoclave Cured, 1.5mm Thick Carbon Fiber Construction

Lightweight Bonded Carbon Strengthening Sections on Top of Diffuser Main Planes for a Rigid Main Plane

Durable and Replaceable Strake Design

CNC Laser and Bent 5052 Aluminum Brackets

Stainless Hardware Throughout




The rear diffuser and undertray were designed to tie together the rear aerodynamic package of the 987 Cayman. Coupled with our Front Dive Plane Kit, this creates our Ventus 1 kit and creates a solid bump in downforce with minimal drag increase. The design maximized the area under the car to hit specific performance goals while being aesthetically pleasing.

In the Ventus 2 kit, coupled with our front splitter and rear wing; a significant increase in downforce is achieved.




Install Manual

Informative Packet